Device for drafting



Nov. 10, 1936. N. NIEMIC 2,060,686

DEVICE FOR DRAFTING Original vFiled Nov. '7, 19:54` 2 Sheets-Sheet l Nov. 1o, 1936.

N. NIEMIC DEVICE FOR DRAFTING Original Filed Nov. 7, 1934 2 Sheets-Sheet 2 Patented Nov. 10, 1936 UNITED STATES DEVICE FOR DRAFTING Norbert Niemic, Detroit, Mich.

Application November 7, 1934, Serial No. 751,899 Renewed April 3, 1986 4 Claims.

This invention relates to an instrument or device for drafting purposes and it aims to provide novel means which will eliminate the individual use of manyy drafting instruments, which for the most part are usually found at random on the drafting board, being in the way of the draftsman and usually picking up dirt and soiling the drawings.

The more specific objects and advantages will become apparent from a consideration of the description following taken in connection with the accompanying drawings illustrating an operative embodiment.

In said drawings:-

Figure 1 is a view in plan of the improved drawing instrument;

Figure 2 is a right hand elevation of the instrument as shown in Figure 1;

Figure 3 is a detail section taken on the line 3-3 of Figure 1;

Figure 4 is a detail View of a portion of the device with the protractor detached in plan;

Figure 5 is an edge view of the part of the device shown in Figure 4;

Figure 6 is a plan view of a portion of the protractor;

Figure '7 is an edge View of the protractor;

Figure 8 is a plan view showing the device in use in connection with a T-square;

Figures 9 and 10 are views similar to Figure 8 but showing the device in different positions relative to the T-square;

Figure 11 is a plan view illustrating the use of the device in drawing an arc, and

Figure 12 is a plan view showing the use of the device in the drawing of another arc.

Referring specifically to the drawings, the instrument has a sheet like, flat body as at I0 made from Celluloid or any other desired material. This body has a side II and an end edge I2, at right angles to each other, another end edge at 60 degrees designated I3, and additional side edges at I4 and I5, respectively at 15 degrees and thirty degrees. The normal use of the device in conu nection with a T-square I6, is suggested in Figure 8 and it will be realized that lines may be drawn at the various angles by following the different edges, with a pencil or other instrument.

In Figures 9 and 10, it will be noted that the position of the device IIJ is changed with respect to that of Figure 8. In Figure 9, for instance, the edges I5, I4, I3, and I I, respectively, are at 60 degrees, 75 degrees, 30 degrees, and 90 degrees. In Figure 10, the edges II, I2, I5, and I4, are

respectively at 60 degrees, 30 degrees, 90 degrees, and degrees.

A suitable protractor is associated with the device along the edge I2 consisting of an arm I'I whose longitudinal edges are parallel and whose free end edge at I8, is at the same angle and a continuation of the edge I5 when the arm I'I is parallel to the edge I2. The protractor arm thus serves as an extension of the edge I5. Said protractor arm I'I may be made of the same material as the instrument I0, for instance Celluloid, and it has a raised pivot stud I9 preferably integral therewith. Such stud is round and undercut at the margin as at 26. The instrument I0 has an extension as at 2l provided with a round opening 22 in which the pivot stud IS is mounted. Attention is called to the fact that the extension 2l from the opening 22 outwardly is split as at 23, so that on opposite sides of the split the device may be sprung or separated to enable attachment and detachment of the pivot stud I9 with respect to the opening 22. It will also be noted that the body or instrument I0 is recessed or cut away in its upper surface as at 24, in order to house an indicator 25, associated with delineations at 26 on the body I0, to show the various angles or positions in which the tractor arm I'I may be placed. The edges of the protractor arm may be followed by a pencil or other instrument in the act of drawing.

A row of any desired number of openings at 2l Y may be provided through the body I0', and some of them may also extend through the protractor at the pivot stud. Through these openings 21, the point of a thumb tack or other instrument may be passed to penetrate the drawing board and permit swinging of the body I0 about the same as an axis. In addition, various openings 28 are provided adjacent the straight edge I I through which a pencil point or a scribing instrument may be passed in order to draw arcs or circles. In this connection, note Figures 11 and 12 where the tack is designated 29 and the pencil is shown at 30, a drawn arc being indicated at 3l.

A number of rows of the openings 28 may be provided and they may be arranged as close together as desired. In addition, any suitable calibrations as at 32 may be provided along the straight edge II.

It will also be noted that the body I0 may be cut out as at 33 to form irregular or French curves for tracing purposes.

Various changes may be resorted to provided they fall within the spirit and scope of the invention.

I claim as my invention:-

1. A device of the class described comprising a body of ilexible material, said body having edges adapted to be followed by a drafting instrument, said body having an opening and being split from said opening to one edge, a protractor arm having a pivot stud, said pivot stud occupying said opening and being applicable and removable through the slit upon distortion of the body.

2. A device of the class described comprising a body of flexible material, said body having edges adapted to be followed by a drafting instrument, said body having an opening and being split from said opening to one edge, a protractor arm having a pivot stud, said pivot stud occupying said opening and being applicable and removable through the slit upon distortion of the body, one edge portion of the body being angular, and the free end of the protractor being angular and a continuation of the first mentioned angular portion.

3. A device of the class described comprising a body of flexible material, said body having edges adapted to be followed by a drafting instrument, said body having an opening and being split from said opening to one edge, a protractor arm having a pivot stud, said pvot stud occupying said opening and being applicable and removable through the slit upon distortion of the body, one edge portion of the body being angular, and the free end of the protractor being angular and a continuation of the irst mentioned angular portion, said protractor comprising an arm with longitudinal edges in parallelism.

4. A device of the class described comprising a body of flexible material, said body having edges adapted to be followed by a drafting instrument, said body having an opening and being split from said opening to one edge, a protractor arm having a pivot stud, said pivot stud occupying said opening and being applicable and removable through the slit upon distortion of the body, one edge portion of the body being angular, and the free end of the protractor being angular and a continuation of the first mentioned angular portion, said protractor comprising an arm with longitudinal edges in parallelism, a pointer on said protractor, said body having a cut-away portion housing said pointer, and indications on the body coacting with the pointer.

NORBERT NIEMIC. 

